BackupPC

References

rsync

• How Rsync works
• A patch for rsync about computing and caching checksums

Troubleshooting

Broken pipe

Typical errors:

rsync_bpc: writefd_unbuffered failed to write 426 bytes to message fd [receiver]: Broken pipe (32)

Possible causes and solutions

• Happens more frequently with big files, but some small files fail too. Not always the same file
• Timeout issue
• Firewall
• Lots of packet loss / reject. The following iptable route might help [1]:

iptables -I {line} -p tcp --tcp-flags SYN,RST,ACK,FIN ACK -j ACCEPT

Links

• Interesting discussion on samba.org, with troubleshooting ideas.

 strace -tt -f -o /tmp/rsync-$$.out rsync \
       --verbose \
       --exclude "stor/hosts" \
       --exclude "var/run" \
       --exclude "var/spool" \
       --rsh="ssh -p $backoff_port" \
       --rsync-path="sudo /usr/local/bin/rsync-debug" \
       --recursive \
       --links \
       --perms \
       --times \
       --owner \
       --group \
       --numeric-ids \
       --xattrs \
       --delete \
       --compress \
       --human-readable \
       --stats \
       --exclude='udat/backup*/*' \
       --exclude='udat/migrate/*' \
       /mnt/stor \
       $userid@$backoff_url:$destdir 2>&1

Issues on Lacie-Cloud

I get failed backup on the lacie-cloud server; I log my findings / tests here.

The current rsync command line is:

/opt/bin/rsync_bpc --bpc-top-dir /shares/backuppc --bpc-host-name zavcxl0005 --bpc-share-name home \
--bpc-bkup-num 1 --bpc-bkup-comp 3 --bpc-bkup-prevnum -1 --bpc-bkup-prevcomp -1 --bpc-bkup-inode0 567 \
--bpc-log-level 3 --super --recursive --protect-args --numeric-ids --perms --owner --group -D --times \
--links --hard-links --delete --partial --log-format=log: %o %i %B %8U,%8G %9l %f%L --stats \
--modify-window=5 --one-file-system --password-file=/shares/backuppc/pc/zavcxl0005/.rsyncdpw6801 \
--exclude=.cache --exclude=.recoll --exclude=.gvfs --exclude=.thumbnails --exclude=.Trash* \
--exclude=*.nobak --exclude=.*.nobak --exclude=.opera/cache --exclude=Snapshots --exclude=Cache \
--exclude=Dropbox --exclude=$RECYCLE.BIN --exclude=$Recycle.Bin --exclude=System Volume Information \
--exclude=lost+found backuppc@zavcxl0005::home /